Abstract: Based on the rotating prism multiple holography andreal- time method, we present a new technique which isa synthetic holographic interferometry. The usage ofthe technique can record both double-exposure hologramand single-exposure hologram on a single holofilm. Theusage of rotating prism can modulate plane referencewaves to record multiple holograms. When the multiplehologram is exactly restituted and the incident angleof plane reconstruction waves equals a modulated angleof plane reference wave, the reconstructed originalimage is at the same place as the original object. Theplace is used as a channel of real-time observation andthe others are served to record double-exposureholograms. In this way, both single-exposure anddouble-exposure holographies can be realized on aholofilm. Observing simultaneously interferograms atstandard state recorded by double exposure and `livingfringe' provided by real-time method, we can comparethe change of standard state with states of differenttimes. The paper presents a synthetic holographicinterferometry and provides a new method for precisereal-time measurement.!4
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